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Mazdoor Kisan Shakti Sangathan 
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IS 15201 (2002): Hydrogen — Code of Safety. ICS 13.200 : 

Jawaharlal Nehru 
'Step Out From the Old to the New' 

■K^y / 1 juaaaws^fea rs^^TTF^ 

2*S< W I *>S*V2^NK^ 


Satyanarayan Gangaram Pitroda 
Invent a New India Using Knowledge 

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"Knowledge is such a treasure which cannot be stolen" 



IS 15201 : 2002 

Indian Standard 

ICS 13.3O0;11.10O.2O 

( * n ^%r \ 

\ v fniranet Print if * f 

©BIS 2002 


NEW DELHI 1 10002 

September 2W2 Price Group 4 

Industrial Safety and Chemical Hazards Sectional Committee, CHD 8 


This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Industrial 
Safety and Chemical Hazards Sectional Committee had been approved by the Chemical Division Council. 

Hydiogcn is used in the hydrogenation of edible and petroleum oils, in the synthesis of ammonia, methanol, 
hydrochloric acid, aluminium alkyls, higher alcohols and aldehydes, in the reduction of metal oxides ( such as iron 
ore) and in welding. Liquid hydrogen is an important cryogenic fluid. 

Hydrogen is a highly flammable liquid or gas and has a dangerous fire and explosion hazard. Exposure to high 
levels of hydrogen gas concentration can cause suffocation for lack of oxygen. Contact with liquid hydrogen can 
cause frostbite. 

There is no ISO Standard on this subject. In the preparation of this Code, considerable assistance has been derived 
from the following publications: 

a) Sax's Dangerous Properties of Industrial Materials, Volume No. 3, 10th edition, Wiley — Interscience 
Publication, John Wiley and Sons. Inc., 2000. 

b) Recommendations on the Transport of Dangerous Goods, 9th revised edition, United Nations, Geneva, 

c) Material Safety Data Sheets, Phase-I, by Indian Chemical Manufacturers Association, 1991. 

d) Handbook of Toxic and Hazardous Chemicals and Carcinogens, Volume II, 3rd edition, Marshall Sittig, 
Noyes Publications, Park Ridge, New Jersey, USA, 1991. 

e) Chemical Safety Data Sheets, Flammable Chemicals, Volume 5, Royal Society of Chemistry, United 
Kingdom, 1992' 

Hydrogen : Production and Marketing , W. N. Smith, J. G. Santangel, ACS Symposium series 1 16 , 1980. 
g) Encyclopedia of Chemistry, S. P. Parker, McGraw Hill, 1982, 

h) Gaseous Hydrogen Stations, Industrial Gases Committee, 32 Boulevard de la Chapelle, 75880, Paris, 
Cedcx 18, France, September 1980. 

The composition of the Committee responsible for formulation of this standard is given in Annex A. 

IS 15201 : 2002 

Indian Standard 


1.1 This code prescribes physical and chemical 
properties of hydrogen gas, the nature of hazards 
associated with it, preventive measures for controlling 
the hazards, and essential information on storage, 
handling, labelling, transportation, waste disposal, 
training of personnel, personal protective equipment, 
first aid and fire fighting. 

1.2 This code does not, however, deal with any 
specification for design of buildings, chemical 
engineering plants, method and ingredients used in the 
manufacture, equipment for waste disposal and 
operation control 


The Indian Standards listed below contain provisions 
which through reference in this text, constitute 
provisions of this standard. At the time of publication, 
the editions indicated were valid. All standards are 
subject to revisions, and parties to agreements based 
on this standard are encouraged to investigate the 
possibility of applying the most recent editions of the 

IS No. Title 

4155 : 1966 Glossary of terms relating to 

chemical and radiation hazards and 
hazardous chemicals 

4379:1981 Identification of contents of 

industrial gas cylinders (first 


For the purpose of this standard, the definitions given 
in IS 4155 shall apply. 


4.1 General Information 

4.1.1 Chemical Name 

4.1.2 Common Name 

Liquid hydrogen, para hydrogen, hydrogen 
(compressed), dihydrogen. 

4.1.3 Molecular Formula 

4.1.4 UN Number 

1049 for gas (hydrogen, compressed), and 

1966 for liquid (refrigerated liquid). 


4.1.5 CASNumber 

4.1.6 Class 

2 (flammable gas). 
4,1.1? Molecular Mass 
2.015 94. 

4.2 Physical Properties 

4.2.1 Description 

Colourless, odourless and tasteless gas. 

4.2.2 Boiling Point 

4.2.3 Melting Point 

4.2.4 Vapour Density (Air = 1) 

4.2.5 Density, g/1 
0.089 9. 

4.2.6 Vapour Pressure (Hg in mm) 
1 570 at -250°C. 

4.2.7 Solubility 

Slightly soluble in alcohol and ether. 1.82 percent 
soluble in water at 20°C. 

4.3 Chemical Properties 

4.3,1 Reactivity 

Hydrogen is stable under normal temperature and 
pressure. Violent reaction or ignition takes place with 
air in presence of catalyst like platinum and similar 
metals containing absorbed oxygen or hydrogen, 
bromine, iodine, dioxane + nickel, lithium, nitrogen 
trifluoride, nickel + oxygen, oxygen difluoride. 

4.4 Fire and Explosion Hazard Properties 
4.4.1 Auto Ignition Temperature 


IS 15201 : 2002 

4.4.2 Flash Point 
Not pertinent. 

4.4.3 Plammability Explosive limits with air f percent(v/v) 

a) Upper explosive limit (UEL) : 74.2 

b) Lower explosive limit (LEL) : 4.0 

4,5 Corrosion Properties * 

Not corrosive. 


5.1 Toxicity 

Hydrogen is not toxic except that it may asphyxiate. \t 
may displace the oxygen in a workplace atmosphere 
and thus act as an asphyxiant. 

5.2 Routes of Entry 

Skin and inhalation. 

5.3 Health Effects 

5.3. 1 Contact of Liquid Hydrogen with Skin 

Direct contact of body tissue with liquid hydrogen can 
cause cold burns or frost bite. 

5.3.2 Asphyxiation 

Hydrogen displaces the oxygen in the workplace 
atmosphere. If atmosphere does not contain enough 
oxygen then inhalation can cause dizziness, un- 
consciousness or even death. 


CkI General 

Personal protective equipment is not an adequate 
substitute for good, safe working conditions, adequate 
ventilation and intelligent conduct on the part of the 
employees. One should keep firmly in mind that 
personal protective equipment protects only the person 
wearing it and other unprotected workers in the area 
may be exposed to danger. 

6.2 Non-Respiratory Equipment 

Personal protecting equipment should include non- 
respiratory equipment like splash-proof safety goggles 
and face shield when working with liquid, unless full 
facepiece respiratory protection is worn for eye 
protection, safety helmets for head protection and boots 
or high top shoes for foot protection. Where exposure 
to cold equipment, vapours, or liquid may occur, 
employees should wear special clothing designed to 
prevent the freezing of body tissues. All protective 
clothing (suits, shirts with long sleeves, insulated 
gloves) should be clean, available each day, and put 

on before work. CufHess trousers should be worn 
outside boots or over high top shoes to shed spilled 


6.3 Respiratory Equipment 

Hydrogen is a simple asphyxiant. It can replace oxygen 
and lead to suffocation. An approved self-contained 
breathing apparatus with a full facepiece operated in 
positive pressure mode should be used in oxygen 
deficient environments. 


7.1 Storage 

7. 1. 1 General Precautions 

7. 1. 1. 1 Hydrogen must be stored to avoid contact with 
heat, flames, sparks and oxygen. Sources of ignition 
such as smoking and open flames are prohibited where 
hydrogen is used, handled or stored. Metal containers involving transfer of large 
quantities of hydrogen should be grounded and bonded . 
Piping should be electrically bonded and grounded. 

7. 1.1.3 Containers must be equipped with self-closing 
valves, pressure vacuum bungs and flame arrestors. Only non-sparking tools and equipment, 
especially when opening and closing containers of 
hydrogen should be used. Wherever hydrogen is used (handled, 
manufactured or stored), approved explosion-proof 
electrical equipment and fittings should be used. Automatic or manual shutdown processes, 
sprinklers, gas and heat sensors with early warning 
audio-visual alarms, flooding, water spraying, 
extinguishing systems, explosion relief devices should 
be available in storage areas. The building shall have good low and high 
level natural ventilation. In areas where natural 
ventilation is not possible, forced ventilation equip- 
ments should be installed. 

7.1.2 Indoor Storage Avoid mechanical damage or overheating of 
storage tanks and cylinders. The vents from the storage tanks, relief valve 
must be led to a safe location to avoid any explosions 
with suitable flame arrestors fitted in it. 

7.1.3 Outdoor Storage Outside storage tanks may be located at least 
15 metres away from building or adjacent to blank 
masonry building walls. The location should be away 
from any flammable liquid storage with adequate 
approved fire protection system. 

IS 15201 : 2002 Cylinders must be protected from direct sun 
rays. Provision of shed should be done for outdoor 

storage of cylinders. 

7.1.4 Bu Ik Storage (Non-refrigerated) 

7. 1.4. 1 Hydrogen is lighter than air and any leak goes 
up the atmosphere readily. It shall be stored in gas tight 
containers either in atmospheric condition or under 
pressure. Storage area should be protected by fire 
hydrants and automatic sprinklers for extinguishing a 

7.L4.3 The storage tanks shall be designed as per 
standard code. 

7. 1.4.4 Each storage tank shall be equipped with relief 
valves. Vent pipes from the valves should terminate 
upward and should have a flame arrestor. Suitable 
provision should be made to prevent anything from 
entering the vents. A drain should also be arranged at 
the bottom of the vent pipe. Any discharge through the 
relief valves should not enter work area or contact 
source of ignition. 

7.2 Handling 

7.2.1 General Hydrogen should be handled wearing an 
approved respirator, chemical resistant gloves and 
safety goggles and other protective clothing {see 6). 

7.2. 1.2 Sources of ignition such as smoking and open 
flames are prohibited where hydrogen is handled. Safety recommendations and safe operating 
procedures should be strictly followed by the persons 
handling hydrogen. 

7.2.2 Handling of Cylinders Before filling the cylinder with hydrogen, 
check and confirm for its validity. It shall have valid 
test certificate from the concerned authorities. Cylinder 
must be hydraulically tested before filling hydrogen 
gas. Both seller and consumer must verify that the 
period of date of testing is still valid. Cylinders should never be subjected to rough 
handling or to abnormal mechanical shock such as 
dropping, bumping, dragging or sliding. They should 
always be kept in vertical position. Ropes, slings, hooks, tongs and similar handling 
devices which may produce sparks or static electricity 
should not be used during handling and use of hydrogen 
cylinder. A suitable hand truck, fork truck or similar 
device to which the cylinders can be firmly secured 
should be used for transporting the cylinders. While handling by crane or derrick, a suitable 
platform, cradle or boat should be used. Use rack or 
chain to hold cylinders in place when hooked up for 
discharging. Do not place or handle cylinders where they 
mi ght form part of an electrical circuit. Do not remove protection cap unless ready to 
withdraw hydrogen from the cylinder. Appropriate and 
standard valves must be used. Explosive gas check of 
valves and fittings should be done before usage. Use only standard colour code (Red colour 
without any band) for hydrogen cylinders (see IS 4379). Cylinders for hydrogen, whether full or empty 
should never be used as rollers for moving heavy or 
bulky articles. No one should tamper with numbers, 
markings, or test dates stamped on cylinders. When the cylinder is empty, disconnect it, 
insert the valve plug and replace the cylinder protective 
cap. Store empty cylinders separate from filled 
cylinders and fasten an 'EMPTY' tag on cylinders 
immediately upon emptying. Close valve, replace plug 
or nut on valve outlet and secure valve protecting cap 

7.3 Labelling 

a) Any vessel containing hydrogen should carry an 
identifying label or stencil. 

b) Label should be as per rules and regulations. 

c) Each cylinder must be labelled with 

7.4 Transportation 
7.4.1 Labelling 

Labels : Class 2 labels must be displayed on the 
transport vehicle: 

a) Compressed gas 

b) Refrigerated liquid 

UN No. 1049, and 
UN No. 1966. 

7.4.2 Pre-departure Checks for Vehicles Carrying 
Hydrogen in Cylinders in Manifold Systems Mounted 
on Trucks Prior to and after loading, the drivers must take 
a complete inspection of the vehicle to ensure that it 
meets all performance safety requirements and is 
roadworthy for transporting hydrogen. A few of the 
numerous items that are checked are the lights, tyres, 
suspensions and brakes. The driver should maintain a log entry book 
for critical parameters like pressure, etc, during transit. Ensure availability of fire extinguishers 
( DCP/carbon dioxide ) on the vehicle. 

IS 15201 :2002 Ensure availability of emergency kit on the 

7.4.2*5 Ensure availability of transport emergency 
(TREM) card and instruction manual during 
transportation on the vehicle. 

7.4.3 During Transportation Do not smoke in the cabin. All sources of 
ignition must be kept away from the truck during 
transportation. Driver should follow specified route only, 
maintain speed limit, never park the truck near 
residential areas, drive truck carefully and observe all 
rules and signals, avoid overtaking of moving vehicles 
and do not leave the truck without watch at any time. No repairs involving gas cutting, welding, etc, 
should be done during transportation period. If required 
at all, repairs should be done by authorized and 
competent personnel of maintenance department/plant 
who are deputed by manufacturer/supplier. The driver should physically inspect complete 
mounting periodically and immediately report any 
abnormality to the supplier. In case of emergency ( for example leaks, fires, 
accident, etc) follow the instructions mentioned in the 

Instruction manual during transportation' to control 
and mitigate an emergency. Immediately contact 
manufacturer/supplier, police, RTO, fire brigade and 
other local authorities. 

7.4.4 Drivers Training 

7.4.4. 1 The basics of any effective safety programme 
for transportation of hydrogen is adequate training. Each driver must be carefully selected and 
receive adequate amount of classroom training, audio- 
visual instructions and job training. The training 
must be done at certified regional training institutes. 
Management must personally qualify each driver 
before he is allowed to deliver hydrogen. Systematic training/retraining and reviews must 
be carried out to ensure that proficiency is maintained. 
Drivers must be trained in the following: 

a) Safe driving methods; 

b) Actions to be taken during emergency; 

c) Proper use of fire extinguishers, emergency kits, 
TREM cards, instruction manuals, etc; and 

d) Communication with manufacturer/supplier. 


8.1 Spillage/Leakages 

8. 1 . 1 Frequent inspections of equipment, containers 
and vessels containing hydrogen should be made to 
detect or prevent teaks. 

8. 1.2 If spills or leaks of hydrogen occur, only properly 
protected personnel should remain in the area and entry 
to others should be restricted. 

8. 1.3 Every organization handling hydrogen must form 
an emergency response team, which is available round 
the clock. Spills or leaks should be handled by the 
emergency response team specially trained to handle 
emergency situations. 

8.1.4 If spills or leaks develop, take measures to hasten 
the dissipation of harmful vapours. 

8. 1.5 In case of a major spill or equipment rupture, the 
exposed area should be evacuated and unprotected 
personnel must not re-enter the area unless declared 

8. 1.6 Proper respiratory protection should be provided 
for use by personnel entering the area for tests 
or to repair damaged equipment as high hydrogen 
concentration may exist. 

8. 1.7 Stop flow of gas/shut off leak , if it can be done 
without risk. 

8. 1 .8 If source of a leak is a cylinder and the leak cannot 
be stopped in place, remove the leaking cylinder to a 
safe place in the open air, and repair leak or allow the 
cylinder to empty. 

8.1.9 In both gas or liquid spills, remove all ignition 

8.2 Evacuation 

If the release is not contained in an appropriate device 
or- system, all personnel not appropriately protected 
must evacuate the contaminated spaces. Evacuation 
of additional areas should be considered as a precaution 
against the spread of the release or subsequent explosion 
or fire. 

8.3 Waste Disposal 

To be burnt under control condition. 


9.1 General 

Hydrogen is highly flammable. Hydrogen flame is 
almost invisible and can cause severe explosions. It is 
easily ignited with many sources of energy, some of 
which are listed below: 

a) Open flames; 

b) Electrical equipments; 

c) Electrostatic sparks; 

d) Sparks from striking objects; 

e) Friction; 

f) Thermite sparks; 

g) Air or oxygen, other oxidants; 
h) Hot surfaces; 

j) Hot hydrogen leaking into ambient air; and 
k) Catalytic surfaces. 

IS 15201 : 2002 

9.2 Fire Prevention 

9.2. 1 Minimize all potential sources of leaks. 

9.2.2 Eliminate as far as possible all sources of ignition. 

9.2.3 Make provision for isolation of hydrogen, means 
of escape and methods of controlling any fire. 

9.2.4 Adequate means of detecting fire and giving early 
warning, alarms in the event of fire shall be provided. 

9.2.5 Emergency Response Procedures and Systems Full emergency procedures and systems shall 
be established and periodic mock drills should be 
carried out. The emergency response team must be well 
trained with respect to 'Do's' and 'Don'ts', standard 
operating procedures (SOP), mitigation systems and 
hazards of hydrogen handling. 

9.3 Fire Fighting 

9.3.1 For Spills Which have not Ignited 

If a spill has not ignited, use water spray to direct 
flammable gas — air mixtures away from sources of 


9.3.2 For Spills Which have Ignited 

9.3.2. 1 Hydrogen flame is almost invisible. Therefore 
proper care should be taken while approaching any 
tlames for Ore fighting. Stop flow of the gas, if possible. Because of danger of re-ignition, hydrogen fires 
normally should not be extinguished until the supply 
of hydrogen has been shut off. Flashback along trail 
may occur. If the flow cannot be stopped, allow the contents 
of the cylinder to burn under control. If liquid hydrogen has ignited, use water to 
keep fire exposed containers cool and to protect men 
trying to stop the source of a spill. 


10.1 Training 

UK 1.1 All personnel engaged in the operation, 
maintenance and attending emergency of hydrogen and 
related systems shall receive training suitable for the 
work on which they are engaged. 

10.1.2 Training shall be arranged to cover all the 
aspects and potential hazards that the particular operator 
is likely to encounter. Training shall cover the 
following areas: 

a) The potential hazards of hydrogen, 

b) Site safety regulations, 

c) Emergency response procedures (leaks/spills/ 

d) Use of fire fighting equipment, 

e) Use of protective clothing/apparatus including 
breathing sets where required, 

First aid, and 

g) Rescue operations. 

10.1.3 In addition, individuals shall receive specific 
training in the activities for which they are employed. 
Refresher courses should be arranged on a periodic 
basis. Older employees should be re-educated. 

10.1.4 Each employee should know the location and 
correct operation of gas and fire alarm systems, 
sprinklers, monitors and other fire fighting equipment. 
They should know the location of safety showers, eye 
washes and first aid boxes. 

10.2 Health Monitoring 

10.2.1 Personal Hygiene 

Employees should take a bath daily after finishing work. 
Eating, drinking or storing of food should be prohibited 
near the place where hydrogen is handled. 

10.2.2 Physical Examination Preplacement physical examinations 

Proper preplacement medical examinations of a 
personnel should be carried out to determine the 
physical fitness before assigning the job. Periodic examination 

Annual medical examination should be carried out as 
required by laws/regulations (Factories Act/State 
Factories Rules), 


1 1.1 General Principles 

First aid treatment should be started at once in all cases 
of contact with hydrogen in any form or injury may 
result. Refer all injured persons to a physician even 
when the injury appears to be slight. Give the physician 
a detailed account of the accident. 

11.2 First Aid Treatment 

11.2.1 Inhalation y 

Inhalation of hydrogen gas causes asphyxiation. 
Remove the affected person from exposure/ 
contamination area. Place him in the recovery position 
as necessary. If breathing has stopped begin rescue 
breathing. If heart action has stopped begin CPR. 
If medical oxygen and trained personnel are available, 
administer oxygen to the affected person. If mi- 

IS 15201 : 2002 

conscious, do not give anything to drink. If conscious 
make the affected person lie or sit down quietly. 

11,2.2 Skin Contact With Liquid Hydrogen 

Treat for frost bile. Soak the affected part in luke warm 
water. Seek medical attention. 

11.2.3 Eyes 
Treat for frost bite. 

1 1 .2.4 Antidote/ Dos ages 

No specific antidote is available. 

( Foreword ) 


Industrial Safety and Chemical Hazards Sectional Committee, CHD 8 

National Safety Council, Mumbai 
Airports Authority oflndia. New Delhi 
Atomic Energy Regulatory Board, Mumbai 
Bhabha Atomic Research Centre, Mumbai 
Central Boiler Board, New Delhi 
Century Rayon, Thane 

Central Leather Research Institute, Chennat 
Central Mining Research Institute, Jharkhand 
Central Warehousing Corporation, New Delhi 
Confederation of Indian Industries, New Delhi 
Department of Explosives, Nagpur 
Department of Industrial Policy and Promotion, 

New Delhi 
Development Commissioner (SSI), New Delhi 
Directorate General of Health Services, New Delhi 
Directorate General Factory Advice Service and 

Labour Institutes, Mumbai 
Directorate of Industrial Safety and Health, 

(Factory Inspectorate), Mumbai 
Directorate General of Mines Safety, Dhanbad 

Employees State Insurance Corporation, New Delhi 
Exec! industries Limited, Mumbai 
I lindustan Aeronautics Limited, Bangalore 
Hindustan Lever Limited, Mumbai 

Indian Institute of Chemical Technology, Hyderabad 
Indian Chemical Manufacturers Association, Mumbai 

Indian Drugs and Pharmaceuticals Limited, Rishikesh 
Indian Petrochemical Corporation Limited, Vadodura 

Indian Space Research Organization, Sriharikota 
Industrial Toxicology Research Centre, Lucknow 
Ministry of Defence (DGQA), New Delhi 

Shri K.C. Gupta (Chairman) 
Shri P. K. Ghosh 
Dr B. N. Rathi 
Shri H. G. Uttamchandani 

Shri S. K. Mishra (Alternate) 
Shri J. K. Pandey 
Dr D. R. Chawla 

Dr A. K, Majumdar 

Shri S. P. Ran a (Alternate) 


Director of Mines Safety (MSE) 
Deputy Director of Mines Safety 
(HQ) (Alternate) 

Shri B.B.Dave 

Shri Aditya Jhavar (Alternate) 
Shri S. Venkateswara Rao 
Shri V. N. Das 

Shri A. A. Panjwani (Alternate) 
Shri P. Vuayraghavan 

Shri M. R. Patel (Alternate I) 

Shri A. V, Sarathy (Alternate II) 
Shri P. N. Sankaran 

Shri V. K, Srivastava (Alternate) 

Dr Virendra Misra 

Dr V. P. Sharma (Alternate) 

Shri M. S. Sultania 

Shri Sujit Ghosh (Alternate) 

(Continued on page 7) 

IS 15201 : 2002 

{Continued from page 6) 

Ministry of Defence, Directorate of Standardization, 

New Delhi 
Ministry of Defence (OFB), Kolkata 

Ministry of Defence (R&D), Kanpur 

Ministry of Environment and Forest, New Delhi 
National Institute of Occupational Health, Ahmedabad 
National Organic Chemical Industries Limited, Thane 

National Safety Council, Mumbai 

Oil Industry Safety Directorate, New Delhi 

Safety Appliances Manufacturers Association, Mumbai 

Standing Fire Advisory Council, New Delhi 

Steel Authority of India Limited, Ranchi 

SI EL Chemical Complex, New Delhi 

Southern Petrochemical Industries Corporation Limited, 

Tata A1G Risk Management Services Limited, Mumbai 
BIS Directorate General 

Represen tative (s) 

Shri P. S, Ahuja 

Lt-Col Tejinder SrNOH (Alternate) 
Dr D. S. S. Ganguly 

Shri R. Srinivasan (Alternate) 
Dr A. K. Saxena 

Dr Rajindra Singh (Alternate) 
Dr B. V. Bapat 

Shri V. R. Narla (Alternate) 
Shri P. M. Rao 

Shri D. Biswas (Alternate) 
Shri S. K.Chakrabarti 

Shri V, K. Srivastava (Alternate) 
Shri V, Jayaraman 

Shri S. Muruganadam (Alternate) 
Shri Urmish D. Shah 

Shri S. K. Chaudhuri, Director & Head (CHD) 
[ Representing Director General (Ex-ojficio) ] 

Member Secretary 

Shri N. K. Pal 

Director (CHD), BIS 

Bureau of" Indian Standards 

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious 
development of the activities of standardization, marking and quality certification of goods and attending to 
connected ma Iters in the country. 


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the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to 
copyright be addressed to the Director (Publication), BIS. 

Review of Indian Standards 

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed 
periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are 
needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards 
should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of 
'BIS Catalogue' and "Standards: Monthly Additions 1 . 

Tins Indian Standard has been developed from Doc: No. CHD 8 (1033). 

Amendments Issued Since Publication 

Amend No. 

Date of Issue 

Text Affected 



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